Built-in antenna and mobile terminal incorporating same

Abstract

A built-in antenna having: a support body that has a top surface shape having a flat plane that has three neighboring sides with two corners defined therebetween and inclined planes that extend downward from the respective three sides and has other planes between the inclined planes; and a metal conductor that is mounted on the support body, the metal conductor having a shape corresponding to the top surface shape of the support body, the shape being formed by bending a metal plate. The metal conductor has a first slit located corresponding to a middle side of the three sides and a second slit located extending downward from one of the two corners, the second slit being communicated with the first slit and having an opened end.

1. A built-in antenna, comprising:
 a support body that has a top surface shape composed of a flat plane that has three neighboring sides with two corners defined therebetween and inclined planes that extend downward from the respective three sides and include other planes between the inclined planes; and  
 a metal conductor that is mounted on the support body, the metal conductor having a shape corresponding to the top surface shape of the support body, the shape being formed by bending a metal plate;  
 wherein the metal conductor includes a first slit located corresponding to a middle side of the three sides and a second slit located extending downward from one of the two corners, the second slit being communicated with the first slit and having an opened end.  
 
   
   
     2. The built-in antenna according to  claim 1 , wherein:
 the lop surface of the support body and the metal conductor include the flat plane of rectangular form, first inclined planes extending downward from the respective three sides and two second inclined planes located at the respective two corners, the second inclined planes connecting between the first inclined planes, such that the top surface of the support body and the metal conductor are shaped to be fitted to each other; and  
 the metal conductor has the second slit between one end of the first inclined plane extending downward from the middle side of the three sides and one of the second inclined planes.  
 
   
   
     3. The built-in antenna according to  claim 1 , wherein:
 the metal conductor is formed by bending the metal plate being shaped by pressing such that the first and second slits have a width that gradually increases from one end of the first slit where the first slit is not connected with the second slit to the opened end of the second slit.  
 
   
   
     4. A mobile terminal, comprising:
 an antenna that is housed in the mobile terminal and is composed of a support body and a metal conductor with a predetermined shape to be mounted on the support body;  
 wherein the antenna is composed of the support body that has a top surface shape composed of a flat plane that has three neighboring sides with two corners defined therebetween and inclined planes that extend downward from the respective three sides and include other planes between the inclined planes, and the metal conductor that is mounted on the support body, the metal conductor having a shape corresponding to the top surface shape of the support body, the shape being formed by bending a metal plate, and the metal conductor includes a first slit located corresponding to a middle side of the three sides and a second slit located extending downward from one of the two corners, the second slit being communicated with the first slit and having an opened end.  
 
   
   
     5. A built-in antenna, comprising:
 a support body that has a top surface shape composed of a polygonal flat plane, three first inclined planes that extend inclining downward from three neighboring sides of sides to define the flat plane, and at least two second inclined planes to connect between each pair of the three first inclined planes; and  
 a metal conductor that is mounted on the support body, the metal conductor having a shape corresponding to the top surface shape of the support body, the shape being formed by bending a metal plate;  
 wherein the metal conductor includes a slit that is formed by cutting so as to expose the periphery of a corner surrounded by the flat plane, neighboring two of the first inclined planes and the second inclined plane to connect between the neighboring two of the first inclined planes.